Liion has released a new 10440 button top protected 350 mAh high quality rechargeable li-ion battery!  10440 is AAA size.  Note that the battery is 3.7V, so it cannot be used in place of an alkaline AAA unless the device can handle the higher voltage.  High quality protection circuit included to help make the battery safe.

Specifications:

• Nominal capacity:  350mAh
• Minimum capacity:  300mAh
• Protection:  Yes, PCB protected
• Top:  Button Top
• Max Discharge Current:  0.7A
• Standard Discharge Current:  0.17A
• Full charge voltage:  4.2V
• Discharge cut-off voltage:  3.0V
• Approximate Length:  47mm +/- 0.5mm
• Approximate Diameter:  10mm +/- 0.2mm
• Weight:  11.8g
• Initial Impedance:  <80milliohms
• Cycle Life:  >500 times 80% capacity